﻿<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title></title>
    <style>
        #result {
            width: 200px;
            height: 100px;
            border: solid 1px #90b;
        }
    </style>
</head>
<body>
    <button>点击发送请求</button>
    <div id="result"></div>

    <script>
        const btn = document.getElementsByTagName('button')[0];
        const result = document.querySelector('#result');

        btn.addEventListener('click', function () {
            //console.log('test');
            const xhr = new XMLHttpRequest();
            xhr.open('GET', 'http://127.0.0.1:8000/ie?t='+Date.now());
            xhr.send();
            xhr.onreadystatechange = function () {
                if (xhr.readyState === 4) {

                    if (xhr.status >= 200 && xhr.status < 300) {
                        result.innerHTML = xhr.response;
                    }
                }
            }
        })
    </script>
</body>
</html>